Altered Cell Microfibrillar Orientation in Ethylene-treated Pisum sativum Stems

Altered Cell Microfibrillar Orientation in Ethylene-treated Pisum sativum Stems.

Effect of Ethylene on Cell Division and Deoxyribonucleic Acid Synthesis in Pisum sativum.

Ethylene and supraoptimal levels of 2,4-dichlorophenoxyacetic acid inhibit the growth of the apical hook region of etiolated Pisum sativum (var. Alaska) seedlings by stopping almost all cell divisions. Cells are prevented from entering prophase. The hormones also retard cell division in intact root tips and completely stop the process in lateral buds. The latter inhibition is reversed partially...

Role of cytokinins in growth correlations between roots and stems in pea (Pisum sativum L.) seedlings

Pea seeds were swollen in solutions with different concentrations of cytokinin benzyladenine (BA). As compared with controls, a low concentration of BA (0.05 mg/l) did not affect the growth of stems and roots of twelve-day-old seedlings but concentrations of 0.20–4.00 mg/l showed an inhibiting effect; this inhibition was proportional to the concentration of BA. In controls the ratio between the...

Reduction in Extractable Deoxyribonucleic Acid Polymerase Activity in Pisum sativum Seedlings by Ethylene.

An extract from the apical portion of etiolated seedlings of Pisum sativum L. was used as a test system to examine the action of ethylene on DNA polymerase activity. The extract catalyzed the polymerization of labeled deoxyribonucleoside triphosphates into a trichloroacetic acid-insoluble product. The system required Mg(2+), nicked DNA, and all four deoxyribonucleoside triphosphates for maximum...

Ethylene is involved in vascular cavity formation in pea (Pisum sativum) primary roots

A lengthy cavity usually forms in the vascular cylinders of pea (Pisum sativum) primary roots in response to sudden flooding at 25°C. This is thought to be a form of aerenchyma. Ethylene has been shown to mediate inducible aerenchyma in maize, therefore the role of ethylene in the formation of cavities in pea roots was examined. Pea seedlings grown for 4 d in 2 L beakers in vermiculite moistene...